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CryptoHack

A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 sara2050 6000
#2 tangcuxiaojikuai 5090
#3 220071601126 4115
#4 oxonia228 4085
#5 1MANE 4080
Recent Solves
Hex jojomojo
Bytes and Big Integers lacccac
Private Keys Guppy
Base64 lacccac
Hex WillyMammoth
Recent Solutions
Let's Prove It Again almantare 0
Lemur XOR Wolverine 0
Lemur XOR Vyper 0
Bean Counter Francesco 0
Favourite byte EllipticCerberus 0

Level Up

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